How Many Layers Of Shingles On A Roof

How many layers of shingles are allowed on a roof.

How many layers of shingles on a roof.

Your three layer roof is definitely a potential structural concern and homeowners insurance companies might consider three layers of roof shingles. So how many layers of roof shingles are allowed. According to the international existing building code homes can be re roofed one time by applying a second layer of roof shingles over the existing one but after that application begins to wear. Most building codes allow up to two layers of organic or fiberglass asphalt shingles.

However this depends upon the roof materials. Richards also estimates that the homeowner saves at least 1 000 in costs associated with removing and properly disposing of the existing shingles. Re roofing may affect the warranty on the new shingles. Keeping a solid roofing layer of shingles is an important way to avoid water damage and leaks.

In some instances 3 layers may be allowed but this is rare. After the roof is stocked the laborers pry up several layers of cap shingles at a time and toss them into plastic trash bins see figure 1. Benefits of adding multiple shingle layers. The contractor may do a walk on the roof and also inspect from the attic for any rot before installing a second layer of shingles.

The roofing crew uses a red ripper roofing demolition tool to pry up cap shingles which are collected in a plastic bin along with old boot flanges and any loose shingle tabs. Laying shingles can be hard and hot work but the reward of an attractive watertight roof can be worth it. So we ll start at the bottom of the deck and work our way up through all the roofing layers until we reach the shingles and sunshine above your roof. This will also be constrained by other factors.

In the portland area as of 2018 the current code allows up to three layers if the current layer is in good condition. Framing includes the roof trusses that sit at the top of your house and support the weight of all the materials used to build your roof. Most areas only allow for a maximum of two layers. Adding this membrane isn t an option with a re roof and the extra layer of shingles offers little protection against ice dams.

Doing it properly will keep you without problems for 20 or 40 years. This is especially true if you ve overlayed your new shingles on top of warped shingles. Be sure to check with the shingle manufacturer regarding all warranty issues and installation requirements before re roofing. The homeowner will have two layers of shingles protecting the roof and the home is less likely to have ice dams he says.

Having multiple layers of shingles is going to make your roof hotter because the heat gets trapped between the layers which could mean premature aging of the shingles. However this depends upon the roof materials.